Phosphor
Date
15 is the atomic number of phosphorus and the chemical element is P.
Incidentally, phosphorus compounds are essential for all living things, including coffee. It is a component of DNA, RNA and ATP.
Source: https://de.wikipedia.org/wiki/Phosphor
Photo: https://www.pexels.com/de-de/foto/kunst-kaffee-kreativ-malerei-7125660/
